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Mathematical Modelling of the Pneumatic Melt Spinning of Isotactic Polypropylene Part II. Dynamic Model of Melt Blowing

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Abstract:

A single-, thin-filament model for stationary meltblowing of nonwovens from isotactic polypropylene is proposed. The Phan-Thien and Tanner constitutive equation of viscoelasticity is used, as well as the effects of stress-induced crystallisation on polymer viscosity and relaxation time during the processing are accounted for. The predetermined air velocity, temperature and pressure fields are assumed, which are computed for different initial air velocities as well as a fixed initial temperature, and approximated along the melt blowing axis by analytical fit formulae.The model is more general and can be applied to the melt blowing of nonwovens from other crystallising polymers and other air fields. The axial profiles of polymer velocity, temperature, tensilestress, pressure, amorphous molecular orientation and the degree of crystallinity can be computed using the model presented.

Tags: melt blowing of nonwovens; modelling of melt air-drawing; dynamic functions in melt air-drawing; air jet dynamics in melt blowing.

Published in issue no 5 (70) / 2008, pages 17–24.

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